Run results for: flatMap vs reduce Saran

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_6_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/146.0.7680.151 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 146

Operating system: iOS 18.6.2

Device Platform: Mobile

Date tested: 4 months ago

reduce with array push

20K/s

flatMap

12K/s

View exact numbers

Test name	Executions per second
✓ reduce with array push	19,609 Ops/sec
flatMap	11,919 Ops/sec

Script Preparation code:

var arr = Array(10_000).fill(0)

Tests:

reduce with array push
arr.reduce((acc, x) => { acc.push(x); acc.push(x); return acc; }, [])
flatMap
arr.flatMap(x => [x, x])